JwtHeaderTokenExtractor.java 文件源码

@Override
public String extract(String header) {
    if (header == null || "".equals(header)) {
        throw new AuthenticationServiceException(
            "Authorization header cannot be blank!"
        );
    }

    if (header.length() < HEADER_PREFIX.length()) {
        throw new AuthenticationServiceException(
            "Invalid authorization header size."
        );
    }

    return header.substring(HEADER_PREFIX.length(), header.length());
}